Depending on valve body materials u

Depending on valve body materials used, post weld heat treating may be required. If so, damage to internal elastomeric and plastic parts, as well as internal metal parts is possible. Threaded connections may also loosen. In general, if post weld heat treating is to be performed, all trim parts should be removed. Contact your Emerson Process Management sales office for additional information.7. YD or YS control valves can be installed in any position, although the recommended position is with the actuator vertical above the valve. For NPS 4 and 6 YS valves, size 80 or larger actuators mounted between 45 degrees above and 45 degrees below horizontal should be supported. If forces other than normal gravitational forces are experienced, such as vibrational forces, smaller size actuators might also need to be supported when they are not in a vertical position. For further information, consult your Emerson Process Management sales office. Table 2. Valve Body Sizes and End Connections VALVES SIZE, NPS CAST IRON VALVES STEEL OR STAINLESS STEEL VALVES 1/2, 3/4 ‐ ‐ ‐ NPT screwed or socket weld1 ‐ ‐ NPT screwed; CL150, 300, or 600 raised‐face or ring‐type joint flanged; buttwelding; or socket weld1‐1/2, 2 NPT screwed; CL125 flat‐face flanged; or CL250 raised‐face flangedNPT screwed; CL150, 300, or 600 raised‐face or ring‐type joint flanged; buttwelding; or socket weld2‐1/2, 3, 4, 6 CL125 flat‐face or CL250 raised‐face flangedCL150, 300, or 600 raised face or ring‐type joint flanged; or buttwelding8 ‐ ‐ CL150, 300, or 600 raised face, ring-type joint, or buttwelding